1.For this information about the porphyrio (purple gallinule, a kind of moorhen) see Aelian, De Natura animalium, 3.42; Athenaeus, Deipnosophistae, 9,388C: the purple gallinule ... when it is domesticated, ... keeps a sharp eye on married women and is so affected if the wife commits adultery, that it ends its life by strangling and so gives warning to its master.